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Translation from Bulgarian State Coat of Arms REPUBLIC OF BULGARIA MINISTRY OF ENVIRONMENT AND WATER 1000 Sofia, 22, Maria Louisa Blvd., telephone: 940 62 19, fax: (+3592) 988 53 16 DECISION ON ENVIRONMENTAL IMPACT ASSESSMENT No. 8-6/2013 Pursuant to Article 99 para 2 of the Environmental Protection Act, Article 19, para 1 of the Ordinance on the conditions and procedure for performance of environmental impact assessment (“EIA Ordinance”) and in conjunction with Article 31 of the Biological Diversity Act and Article 39, para 12 and 13 of the Ordinance on the conditions and procedure for performance of assessment of the compatibility of plans, programmes, projects and investment proposals with the subject and objectives for preservation of protected territories (“CA Ordinance”), I HEREBY APPROVE The implementation of investment proposal for Decommission of Units 1 - 4 of Kozloduy NPP Contracting authority: State Enterprise Radioactive Waste Seat: 1797 Sofia, 52A G. M. Dimitrov Blvd., floor 6 Short description of the investment proposal: The investment proposal envisages decommissioning of Units 1 to 4 of Kozloduy NPP. Units 1 to 4 of Kozloduy NPP are with reactors of the WWER-440/230 type and are commissioned during the period from 1974 (Unit 1) to 1982 (Unit 4). The general characteristics of power units 1 to 4 are as follows: • The reactors of are of the water-water reactor type operating with pressurized water, with two circuits – primary and secondary. Units 1 to 4 have a capacity of 440 MW each. 235 • The fuel for Units 1 to 4 is UO2, with enrichment of up to 3.6%, U. • Units 1 to 4 have six main coolant loops of the primary circuit, with six main circulation pumps and six steam generators. • Each of the WWER-440 reactors and the primary coolant circuit is located in a concrete structure of hermetically sealed premises. The territory planned for the needs of decommissioning Units 1 to 4 of Kozloduy NPP is situated on the site of the nuclear power plant. Same is located at a straight-line distance of 120km from the city of Sofia, equaling 200 km by road. It is situated in the northwestern part of Bulgaria on the right bank of the Danube River, at a distance of 5km to the southeast of the town of Kozloduy. The site is located opposite 694th kilometre along the line of the Danube River, at a distance of 3.7km to the south of the river’s water course and the state border with Romania. The activities of decommissioning Units 1 to 4 are planned on the territory of these Units as the generated waste is to be transported to sites on which it will be stored safely and temporarily. The area of the entire site is about 3.2 km2, and when adding the channels of circulation and service water supply, it reaches 5.2 km2. The main structures of auxiliary buildings of Units 1 to 4 of Kozloduy NPP are located within an area of 1.4 km2. From administrative point of view, Units 1 to 4 are separated from Units 5 and 6. The initial strategy for decommissioning includes the preparation and operation of the Safe Enclosure Zone (SE) of the reactor compartments (RC) and of the auxiliary buildings for a period of 35 years, and as a last stage, the performance of deferred dismantling is envisaged. In the process of analysis and assessment, while taking into account all technical, economic and social aspects and based on international experience, this strategy is updated to a strategy of continuous dismantling. The main characteristic of this alternative is the continuous dismantling of equipment and facilities and the continuous process of waste management, as well as control (monitoring) of SE, conforming to all requirements for environment protection and radiation protection. The continuous dismantling is a selected combination of the two possible alternative options: • Immediate dismantling of certain facilities and equipment; • Deferred dismantling of other facilities and equipment. The updated strategy does not provide for fixed dates for completion of the activities/stages. Within the concept of continuous dismantling, deferred dismantling does not provide for long-duration safe storage. The adopted approach has the purpose of attaining smooth transition between the individual stages. According to the Strategy for continuous dismantling of Units 1 to 4, the auxiliary buildings (AB) and the ventilation stacks (VS) are excluded from the Safe Enclosure Zone, which 2 allows their use as facilities for radioactive waste management. The auxiliary buildings remain with a special status, for the purpose of being used for the individual phases of the decommissioning activities. The scope of SE is limited to the reactor compartments of the Units, to a part of the sanitary building and their connecting trestle bridges. The updated strategy for continuous dismantling in the course of decommissioning Units 1 to 4 of Kozloduy NPP comprises the following two stages: • Stage 1: preparation and controlling of the Safe Enclosure of Reactor Compartments 1 and 2 and dismantling of the equipment falling beyond the Safe Enclosure Zone; • Stage 2: deferred dismantling of the equipment within the Safe Enclosure Zone and exemption of the building from regulatory control. The dismantling commencement is complied with the terms set in the Strategy for Spent Nuclear Fuel and Radioactive Waste Management by 2030. • The last stage of the decommissioning process is closure and reclamation. Stage 1 includes the phases of Safe Enclosure Preparation and Safe Enclosure Control, as well as dismantling of the equipment outside the SE Zone. А. Activities during the Phase of Safe Enclosure Preparation The activities performed during the preparation of RCs of Units 1 to 4 for SE, and respectively of Units 3 and 4, are grouped as follows: • Activities outside the SE Zone; • Activities along the borders of the SE Zone – isolation of all unnecessary connections of RC to the machine hall and of such connections to AB-1; dismantling of equipment and devices located on the border of the isolated contaminated circuits, the integrity of which cannot be guaranteed for the SE period, implementation of construction measures for SE preparation; • Activities in the SE Zone – marking of the systems which remain in operation during the Units’ decommissioning with signs; isolation of all systems which are not needed for SE (ventilation, electric, controls and instruments (C&I), technological); isolation of the operating part of the systems which remain functioning during SE within the part which does not remain in operation (ventilation, electric, C&I, technological) removal of fluids from the systems; removal of hazardous materials, removal of combustible materials; removal of iodine filtres; replacement of aerosol filtres remaining in operation during SE; switch- off/disconnection of all electric systems, which are put out of operation in SE; removal of the insulation of the systems which are subject of decontamination; conservation of the systems 3 and equipment, which may be used during or after SE (manipulation systems, hoisting equipment); arranging of ventilation zones (sections); adaptation of the existing systems which are necessary for SE. B. Activities during the Safe Enclosure Control Phase Safe Enclosure of Reactor Compartment 1 and Reactor Compartment 2 The phase is characterized by minimum control and management activities: periodic inspections rounds and testing of the equipment; replacement of aerosol filtres; maintenance of the buildings and facilities remaining in operation; renovation of the operation systems during the SE period (if necessary); installation of heaters in the steam generator confinements (if necessary). C. Dismantling of the equipment outside the Safe Enclosure Zone (machine hall) Dismantling of the equipment outside the Safe Enclosure Zone is planned by starting with the equipment in the non-contaminated buildings and in the Machine Hall (MH) of Units 1 -4, namely: • Dismantling of non-contaminated equipment; • Dismantling of turbines; • Dismantling of the secondary circuit; • The plan of Kozloduy NPP for dismantling of the equipment from Units 1 to 4 of Kozloduy NPP outside the SE Zone follows the usual practice of projects for decommissioning of nuclear power units. For dismantling the equipment in the machine halls and other auxiliary buildings there shall be used conventional, predominantly manual or remotely controlled tools and cutting machines. Smaller components and equipment will be initially removed in order to make additional space for removal and maneuvering with large components. The end of Stage 1 is determined based on the dismantling completion outside the Safe Enclosure Zone. The performance of Stage 2 starts before the completion of Stage 1, as per the terms underlying the Strategy for SNF and RAW management by 2030 for the purpose of ensuring smooth transition between the two stages. During Stage 2 dismantling of the equipment in the Safe Enclosure Zone will be carried out. It is envisaged for the large equipment of the primary circuit of the Units to be dismantled in whole and stored in a repository specially built on the site for temporary storage of transitional RAW (“decay storage”). Dismantling of the reactors and active components 4 around them will be performed. It is planned to dismantle the reactor buildings last, in whole (without cutting) following a reverse order relative to their installation order, as for their removal from the pits and transferring to the transport corridor, the 250-ton cranes located in the RC will be used. The inner reactor building equipment will be returned inside the reactor building and will be transported to the repository and stored in one common container with the reactor building. It is planned for the reactor buildings to be stored in concrete or reinforced concrete containers specially developed for that purpose. At the end of this stage, the site and the building will be exempted from control in order to be used for other industrial purposes.
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